Prior to the performance of every job of flame-retardant chemical application by a registered flame-retardant application concern on the premises of any occupancy mentioned in Sections 13115 or 13119 of the Health and Safety Code, such concern shall first notify the local fire department or the nearest office of the State Fire Marshal, giving the time and date that the job is to be performed. This provision shall not apply to work done by an application concern on its own premises. The fire department or State Fire Marshal may take samples both of the chemical being applied and of the finished treated fabric(s).